The accuracy of simulation for restricted shallow water almost certainly is lower than that obtained for deepwater maneuvering, because the latter situation has a much larger research base and does not require the use of so many heuristic models. Currently, no guidelines are available for assessing the accuracy required from the mathematical model to develop results useful for waterway design. Likewise, there is no numerical measure available for determining the accuracy of pilotage modeling. In particular, no guidelines are available for determining the level of simulation required for a particular situation or for an appropriate analysis of its results.
The state of practice is to use subjective measures (for example, interviews with pilots) to validate the overall simulation and subjective interpretations of the simulation results in terms of overall risk corresponding to the waterway design. Although questions about accuracy, validation, and interpretation cannot be resolved objectively, simulation has proven extremely useful in some applications (see Chapter 7).